Mid/Senior QA Engineer - Jumper

Jumper is crypto’s everything-exchange powered by LI.FI. By building on the sophisticated cross-chain infrastructure of LI.FI, we offer a comprehensive multi-chain experience for any and every person in crypto to move and use their funds across chains as easily and flexibly as they desire.

Our vision? We want to make multi-chain DeFi easy and fun!

While we live under LI.FI’s umbrella, we pride ourselves in our small but excellent and very agile team. Jumper already has over 150k active users, and still we are only now getting started to build it from the ground up - as an independent spin-off from LI.FI.

Setting yourself up for success

• Take a moment to read the job description before applying. We want to make sure this role is the right fit for you, so you don't spend time on an application that isn’t aligned with your experience. If this one doesn't quite match, we encourage you to submit your resume to our talent pool!

• Focus on your application, there's no need to reach out to team members directly. We review all applications thoroughly, so rest assured your submission will be carefully considered! If you have questions about which role might be the best fit for you, feel free to reach out to career@li.finance.

• To apply, please submit your resume detailing your relevant experiences and competencies. We love to see how your work has made a difference—whether it’s improving processes, increasing efficiency, or leading a project to success, so be sure to highlight this in your resume!

A quick run-down of the job

We’re looking for a Mid/Senior QA Engineer to raise the bar for quality across Jumper, shaping testing strategy, automation, and reliability for a product used by thousands of DeFi users every day.

If you love catching the bugs before they hatch, bringing structure to complex systems, and working closely with engineers on something technically challenging and genuinely useful, this one’s for you.

What you’ll do

• Take ownership of QA planning and execution across Jumper.Exchange’s core features; from UI to API to cross-chain integrations.

• Build, maintain, and scale automated testing frameworks with Playwright, Jest, and related tooling.

• Work closely with engineering, product, and security to review requirements, test new releases, and improve our processes.

• Investigate, reproduce, and help resolve production issues, driving real fixes, not just reports.

• Monitor quality metrics and help shape continuous improvement initiatives.

• Champion a “quality-first” mindset within the team, balancing speed with stability.

What makes a good candidate

• 3+ years of experience in QA or software testing, ideally in a fast-moving product company.

• Strong hands-on experience with Playwright and Jest for automated and integration testing.

• Solid foundation in API testing, CI/CD pipelines, and end-to-end quality practices.

• Experience or curiosity for blockchain, DeFi, or cross-chain technologies.

• Great communication and collaboration skills, you’ll be working with distributed teams across engineering, product, and design.

• Analytical, detail-oriented, and proactive in spotting and solving quality issues.

• Fluent in English and located within the EMEA timezone.

Nice to have

• Familiarity with PostgreSQL and Redis for database and caching layer testing.

• Understanding of Ethereum-based testing libraries (Viem, Wagmi).

• Experience in QA for high-traffic or fintech/blockchain applications.

We encourage you to apply if you feel your experience and skills equip you for this job but are not listed here!

Company culture

• Embracing the differences

  • Embrace your own differences

  • Respect and welcome the unique qualities of others

  • See others’ differences as an opportunity to grow

• Own it, do it

  • Own tasks end-to-end

  • Hold yourself to a high bar for execution

  • Make bold decisions, and be accountable

  • Understand your limitations and seek for help

• Fail forward

  • Try - don’t be afraid to fail

  • Learn - don’t make the same mistake twice

  • Adapt - grow with the experience

• Have fun together

  • Take the time to get to know and understand each other better

  • Don’t take yourself too seriously and keep it light-hearted

  • Fun should be coming from a place of love and respect

What you’ll get

• Annual team offsites (Thailand in 2023 and Vietnam in 2024 were a blast, Marrakech in March 2025 was blast-ier; let’s see what happens in 2026!)

• 30 days of PTO

• Flexible remote days

• Flexible working hours

• Equity participation from day 1

• Entitlement to work computer (choice of equipment)

• An annual 1,000€ personal development budget once you have worked 6+ months (pro-rated the first year)

• A one-time 1,000€ remote budget to use on coworking, office setup, etc.

If you join us as an independent contractor, you’re only entitled to the first five benefits of this list.

Application process

Setting yourself up for success starts with the application! Click here to discover valuable tips that will help you navigate our application process effectively.

LI.FI is an equal opportunity employer. We encourage individuals of all backgrounds to apply. Join us in our dedication to fostering a workplace that values and respects each team member's unique contributions.

Shortlisted candidates will undergo a comprehensive interview process, including a people operations interview, a take-home assignment, a meet-the-team & founder interview, and a reference check.

For more information, visit our page detailing our hiring process!